What is the meaning of Mac?

ISO 639-2/B language code for Macedonian.

Clipping of mackintosh (a raincoat).

Clipping of macaroni.

small stone, pebble

Clipping of maquereau (pimp).

Clipping of Macintosh.

son

A common prefix of many Irish and Scottish names, signifying "son of".

sin

Alternative form of make (equal, partner)

son

bond, surety

mother (human female who begets a child)

fire

light firearm

prison

mother

son

poppy

quack (sound made by ducks)

son

Used as a prefix for Irish and Scottish patronymic surnames; -son

Source: wiktionary.org